Add WebrtcVideoEncoder interface

remoting/protocol/webrtc_dummy_video_encoder.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef REMOTING_PROTOCOL_WEBRTC_VIDEO_ENCODER_FACTORY_H_
-#define REMOTING_PROTOCOL_WEBRTC_VIDEO_ENCODER_FACTORY_H_
+#ifndef REMOTING_PROTOCOL_DUMMY_WEBRTC_VIDEO_ENCODER_H_
+#define REMOTING_PROTOCOL_DUMMY_WEBRTC_VIDEO_ENCODER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/synchronization/lock.h"
-#include "remoting/proto/video.pb.h"
+#include "remoting/codec/webrtc_video_encoder.h"
 #include "third_party/webrtc/media/engine/webrtcvideoencoderfactory.h"
 #include "third_party/webrtc/modules/video_coding/include/video_codec_interface.h"
 
 namespace remoting {
+namespace protocol {
 
 using TargetBitrateCallback = base::Callback<void(int)>;
 
-// This is the interface between the Webrtc engine and the external encoder
-// provided by remoting. Webrtc provides feedback on network bandwidth, latency
-// & RTT and in turn remoting passes encoded frames as they get encoded
-// through the capture pipeline.
-class WebrtcVideoEncoder : public webrtc::VideoEncoder {
+// WebrtcDummyVideoEncoder implements webrtc::VideoEncoder interface for WebRTC.
+// It's responsible for getting  feedback on network bandwidth, latency & RTT
+// and passing this information to the WebrtcVideoStream through the callbacks
+// in WebrtcDummyVideoEncoderFactory. Video frames are captured encoded outside
+// of this dummy encoder (in WebrtcVideoEncoded called from WebrtcVideoStream).
+// They are passed to SendEncodedFrame() to be delivered to the network layer.
+class WebrtcDummyVideoEncoder : public webrtc::VideoEncoder {
  public:
   enum State { kUninitialized = 0, kInitialized };
-  explicit WebrtcVideoEncoder(webrtc::VideoCodecType codec);
-  ~WebrtcVideoEncoder() override;
+  explicit WebrtcDummyVideoEncoder(webrtc::VideoCodecType codec);
+  ~WebrtcDummyVideoEncoder() override;
 
   // webrtc::VideoEncoder overrides
   int32_t InitEncode(const webrtc::VideoCodec* codec_settings,
                      int32_t number_of_cores,
                      size_t max_payload_size) override;
   int32_t RegisterEncodeCompleteCallback(
       webrtc::EncodedImageCallback* callback) override;
   int32_t Release() override;
   int32_t Encode(const webrtc::VideoFrame& frame,
                  const webrtc::CodecSpecificInfo* codec_specific_info,
                  const std::vector<webrtc::FrameType>* frame_types) override;
   int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
   int32_t SetRates(uint32_t bitrate, uint32_t framerate) override;
 
   webrtc::EncodedImageCallback::Result SendEncodedFrame(
-      std::unique_ptr<VideoPacket> packet,
+      std::unique_ptr<WebrtcVideoEncoder::EncodedFrame> frame,
       base::TimeTicks capture_time);
   void SetKeyFrameRequestCallback(const base::Closure& key_frame_request);
   void SetTargetBitrateCallback(const TargetBitrateCallback& target_bitrate_cb);
 
  private:
   // Protects |encoded_callback_|, |key_frame_request_|,
   // |target_bitrate_cb_| and |state_|.
   base::Lock lock_;
   State state_;
   webrtc::EncodedImageCallback* encoded_callback_;
 
   base::Closure key_frame_request_;
   TargetBitrateCallback target_bitrate_cb_;
   webrtc::VideoCodecType video_codec_type_;
 };
 
 // This is the external encoder factory implementation that is passed to
 // WebRTC at the time of creation of peer connection. The external encoder
 // factory primarily manages creation and destruction of encoder.
-class WebrtcVideoEncoderFactory : public cricket::WebRtcVideoEncoderFactory {
+class WebrtcDummyVideoEncoderFactory
+    : public cricket::WebRtcVideoEncoderFactory {
  public:
-  WebrtcVideoEncoderFactory();
-  ~WebrtcVideoEncoderFactory() override;
+  WebrtcDummyVideoEncoderFactory();
+  ~WebrtcDummyVideoEncoderFactory() override;
 
   webrtc::VideoEncoder* CreateVideoEncoder(
       webrtc::VideoCodecType type) override;
   const std::vector<cricket::WebRtcVideoEncoderFactory::VideoCodec>& codecs()
       const override;
 
   // Returns true to directly provide encoded frames to webrtc
   bool EncoderTypeHasInternalSource(webrtc::VideoCodecType type) const override;
   void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) override;
 
   webrtc::EncodedImageCallback::Result SendEncodedFrame(
-      std::unique_ptr<VideoPacket> packet,
+      std::unique_ptr<WebrtcVideoEncoder::EncodedFrame> packet,
       base::TimeTicks capture_time);
 
   void SetKeyFrameRequestCallback(const base::Closure& key_frame_request);
   void SetTargetBitrateCallback(const TargetBitrateCallback& target_bitrate_cb);
 
  private:
   // Protects |key_frame_request_| and |target_bitrate_cb_|.
   base::Lock lock_;
   base::Closure key_frame_request_;
   TargetBitrateCallback target_bitrate_cb_;
   std::vector<cricket::WebRtcVideoEncoderFactory::VideoCodec> codecs_;
-  std::vector<std::unique_ptr<WebrtcVideoEncoder>> encoders_;
+  std::vector<std::unique_ptr<WebrtcDummyVideoEncoder>> encoders_;
 };
 
+}  // namespace protocol
 }  // namespace remoting
 
-#endif  // REMOTING_PROTOCOL_WEBRTC_VIDEO_ENCODER_FACTORY_H_
+#endif  // REMOTING_PROTOCOL_DUMMY_WEBRTC_VIDEO_ENCODER_H_